Cam for flat-knitting machines.



H. SCHWARTZ & A. A. GRUNDY.

CAM FOR FLAT KNITTING MACHINES.

APPLICATION FILED AUGJl, 1915- 1,210,107. Patented Dec. 26,1916.

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HERMAN son'wan'raor PHILADELPHIA, 'rnnnsrnvama, artpnrirnnn A. GRUNDY,

or BROOKLYN, NEW YORK, nssrerrozas To 0]? PHILADELPHIA, PENNSYLVANIA.

Specification of Letters Patent.

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v r CAM roe FLAT-KNITTING MACHINES.

Application filed August 11, 1915. Serial 110.,421572.

ing drawings, which fornra part of this specification. 1 a

'The ob ect of our invention 1S, to con-r struct, connect and arrange the cams of a knitting machine so as to obviate the danger of breakage or damage of needles and cams by reason of conditions, due to im proper operation or otherwise, that are productiveof such damage and breakage in the ordinary operation of the machine.

Another object of the invention is to prolong the life of the cams by rendering them interchangeable or reversible.

A preferred embodiment of our invention ,is shown inthe accompanying drawinns in which Figure 1 is a cross section through the needle bed of a flat or straight knitting machine in connection with which our improved cams may be used. Fig.2 is an enlarged face view of the cam plate and cams. Fig. 3 is a partial section on line 33 of Fig. 2.

Upon the needle bed a on each side of the machineare slidable the needles 6 bvmeans of their, butts c. As is well understood in the art. these butts are actuated to move the needles of opposite banks/coward andfrom each other in the operation of forming the knitted fabric. by means of cams mounted upon cam plates d, which are moved transverselvacross the banks of needles.

As shown in Fig. 1 rails 0. 77, are provided with ways in which slide the cam plates at y p As shown in Fig. 2. cams e, e',1f, f, g, g, h, h and 2' are mounted in the usual manner. m, g shows the path of the needle butts through the cams in direction of the arrow 11 It is seen that the butts move cam i to its lower position shown in dotted lines. Moving in the reverse direction the hutts strike corner 2 of cam c and raise the came again to thefull line position. I In this movement the pivot of cam i is so placedv in relation to the corner a struck by the needle butts that the action of tilting the cam'up is accomplished very easily and does not tend, as heretofore, to stop and breakthe butts in" the rapid passage of the cam plate overthe needle bed. I

Patented Dec.26,191 6;

In order to be able when desired to work with came held immovable inits upper po-. sition a stop pin 1' is provided which is spring pressed into its active position as shownin Fig. 8, and is retractable by means of the cam lever s. a a

It is seen that when cam z' is in its upper positionthere is a space between corner a and the contiguous side of cam it into which needle butts may drop if for any reason the cam plate stops or hesitates in its passage through the machine, causing jamming and breakage of the needles. Similarly when cam i is in dotted line position there is an open space between side at and the contiguousside of cam h. To obviate this contingency, we have provided a thin plate 7c bridging the entire space between camsuh and 72 'Thisbridge pieceiis preferably made ofvery thin steel, and is at o tached to cams h, it so as to present a flush I outer surface. Also cam z' is made slightly thinner than cam h, It, so as to move freely between the bridge piece and the cam plate.

By this means, nomatter what the position of cam 2' mav be, the butts 0f the needles are prevented from dropping intoany part of the space between cams It and h and yet remain guided by the cams just as positively as *before;

Bv shaping the cams and arranging them' relatively to each other, as shown, we are enabled to make them re ersible. therebv doubling theirlength of life. Thus when cams y; g are worn and need to be replaced, they are so similarly shaped that they may be removed from the plate, and substituted the one for the othenplacing the worn faces against the plate and presenting fresh new surfaces to the work.

In like manner 71, and k may be reversed and substituted for each other. Cam 2' is made of symmetrical shape and may be reversed to bring its fresh new surface out against the work.

It will be understood that while the bridge-piece 7c is not limited in its application to cams constructed and arranged specifically as shown and described, still it is especially adapted for use in connection with cams of'the specific construction or" cams h and 71 and more especially cam That is, while cams so construct-ed obviate the danger of jamming and breaking from.

one-cause,- they' create Wide spaces on one side or the other of cam d into which the needles would drop were it not for the I bridgerpiece.

' spaoed' 'apart, the upper cams cooperating witl1"the"lower cams to guide-the needle butts, a bridge-piece connecting the said two lower cams, and a third" pivoted lower cam -looated'betweenthe said two lower canis afnd extendingbetween the cam plate and'the bridge 'pie'ce.

2. In' knitting-machine -c'ams,"the combination ofth-e-camplate, the two lower cams spaced apart, the upper" cams cooperating with the 'lo'wer 'c'amst -guide the needle butts, a bridge piece connecting the said two lower" cams, *and a'th'ird lower cam located between the first named two lower cams andextending between the cam plate and t'h bri'dgdpie'ce, the 'third cam being pivoted to the cam'plateon alevel withthe lower parts of thetwo first-mentioned lower cams and nearer to one canrth'an to the other.

3. 111" knitting machine cams, the "combi nation of the' cam"plate,'the two lower cams spacedapart, the 'npper cams" cooperating with: thev lower pams to guide the needle butts, a bridge piece "connecting the" said 1 two lower cams, and whose-upper face is Copies of this patent may be obtained for-five cents each, byaddressingthe Commissioner of' -Patents,

flush with the adjacent horizontal edges thereof, and a third pivoted-cam located between said two lower cams and extending between the cam plate and. the bridge-piece.

4. In knitting machine cams," the combination ofthe cam plate, the two lower fixed ca'ins spaced apart, the upper cams cooperating with the lower cams to guide the: needle butts, a movable cam located between the two fixed lower cams, said movable cam being pivoted to the cam plate relatively close to the lower part of the inner straight edge of one' of the two fixed lower Gains" and adapted, when swungagainst either of the lowef fixed cams, toleave a' substantial space between 'itseli' and the other lower fixed cam, and abridge piece spanning the space between the two lower fixed cams and overlying the movable pivoted cam. l

i 5. In knitting machine cams, the con1bination witli tl1ecam"plate, of two interchangeable lower cams spaced apart, two central abutting and-interchangeable upper cams, two interchangeable upper cams adjacent tothe'respective central cams, and a pivoted lower cam arranged between the first-named twolower cams.

6. In knitting machine canis, the combination with the-cam plate,- 'of the upper c'ains,'the two fixed lower cams spaced apart, and a piv'oted'lower cam arranged between the two fixed'lower' cams, said pivoted'cam being symmetrical 'to permit reversal.

' 7. 1n knitting machine calns, the combination with the'cam' plate', of"two interchangeable fixed l'o'wercznns sp aced apart, of a"p'air" of abutting and interchangeable upper cams, and a pivoted lower-"cairn arranged between "the twofixed lower cams, said pivoted cambeing symmetrical to per- Init reversal. a

In testimony of which invention: we have hereunto set our "hands, at Philadelphia, on this'9th day ofAugust,' 1915.

HERMAN SCHWARTZ.

ALFRED GRUNDY. V

ashington, D. C. 

